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Simplifying 21 + -6r = 3 + -3r Solving 21 + -6r = 3 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 21 + -6r + 3r = 3 + -3r + 3r Combine like terms: -6r + 3r = -3r 21 + -3r = 3 + -3r + 3r Combine like terms: -3r + 3r = 0 21 + -3r = 3 + 0 21 + -3r = 3 Add '-21' to each side of the equation. 21 + -21 + -3r = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -3r = 3 + -21 -3r = 3 + -21 Combine like terms: 3 + -21 = -18 -3r = -18 Divide each side by '-3'. r = 6 Simplifying r = 6
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